DEEP-WELL PUMPING UNIT Russian patent published in 2008 - IPC F04B47/04 

FIELD: oil producing industry.

SUBSTANCE: invention designed for producing oil or pumping other formation fluids. Pack of plate springs to return piston in upper position is installed in cylinder of submersible set. Piston is made cylindrical. Piston with pack of plate springs forms plunger pair and plays part of hydraulic motor and pump. Cylinder of submersible set has housing forming with cylinder ring space communicating with ring space formed by oil well tubings. Pass holes are made in cylinder between its bottom and pack of plate springs. Delivery valve is installed in ring space formed by cylinder and cylinder housing in place of pass holes in form of enclosing cylindrical split member with stops to limit sliding along cylinder of submersible set. Delivery valve can be installed also in ring space formed by oil well tubings in place of its connection with space formed by cylinder and cylinder housing. Delivery valve is made in form of split bushing or in form of ground washer. Delivery line of working liquid has divider consisting of diaphragm and two conical cups.

EFFECT: simplified design, increased reliability in operation, reduced power consumption in process of oil producing.

8 cl, 1 dwg